Target ESLint 9 and support flat config (#774)

Author: spence-s

.github/workflows/main.yml

@@ -1,4 +1,5 @@
 name: CI
+
 on:
   - push
   - pull_request
@@ -10,14 +11,15 @@ jobs:
       fail-fast: false
       matrix:
         node-version:
+          - 22
           - 20
           - 18
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
-      - run: npm install --force
+      - run: npm install
       - run: npm test
       # - uses: codecov/codecov-action@v1
       #   if: matrix.node-version == 14

.gitignore

@@ -10,3 +10,5 @@ test/fixtures/typescript/extends-tsconfig-bases/node_modules/.cache
 test/fixtures/typescript/extends-array/node_modules/.cache
 .nyc_output
 coverage
+
+dist